The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 06, 1993
Filed:
Aug. 29, 1991
Applicant:
Inventors:
Lewis B Benson, Coraopolis, PA (US);
Yungli J Lee, Lancaster, PA (US);
John W College, Pittsburgh, PA (US);
Assignee:
Dravo Lime Company, Pittsburgh, PA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B01D / ;
U.S. Cl.
CPC ...
423235 ; 423239 ; 4232422 ; 42324307 ;
Abstract
A process for removing sulfur dioxide and nitrogen oxide from flue gases in a wet scrubbing system using lime to remove the sulfur dioxide and ferrous-EDTA to remove the nitrogen oxides, where an initial reducing agent, such as sodium sulfide, and an antioxidant, such as hydrazine, are added to the scrubbing system, with oxidation of the ferrous-EDTA to ferric-EDTA curtailed while removal of nitrogen oxides is increased.